Carbon nanotubes on HPLC silica microspheres

Menna, Enzo; Negra, Federico Della; Prato, Maurizio; Tagmatarchis, Nikos; Ciogli, Alessia; Gasparrini, Francesco; Misiti, D.; Villani, Claudio

doi:10.1016/j.carbon.2006.02.032

Cited by 56 publications

(32 citation statements)

References 9 publications

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“…The CNTs have excellent mechanical strength, are thermally stable and exhibit high electrical as well as thermal conductivity [27][28][29]. In recent years carbon nanotubes have attracted great attention with its unique sorption property in various applications [30][31][32]. They have been used as sorbents for hydrogen storage [33,34], and in the efficient removal of trace contaminants from water [35,36] and air [21,24,[37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Methane preconcentration in a microtrap using multiwalled carbon nanotubes as sorbents

Saridara

Ragunath

et al. 2010

Analytica Chimica Acta

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Section: Introductionmentioning

confidence: 99%

Methane preconcentration in a microtrap using multiwalled carbon nanotubes as sorbents

Saridara

Ragunath

et al. 2010

Analytica Chimica Acta

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“…The number of papers focused on CNTs as stationary phases for liquid chromatography is lower than that for GC application [16][17][18][19][20][21], although it has increased in recent years [11][12][13][14][15]. With regard to GC, analytes in a large polarity range have been tested, often with better results than with more traditional sorbents [8].…”

Section: Introductionmentioning

confidence: 97%

Improving selectivity in gas chromatography by using chemically modified multi-walled carbon nanotubes as stationary phase

et al. 2012

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Amino-terminated alkyl MWCNTs (MWCNTs-R-NH(2)), synthesized by chemical modification of the nanotube skeleton by nucleophilic substitution with 2,2'-(ethylenedioxy)diethylamine, were successfully used as stationary phases for gas chromatographic separation of esters and chloroaromatics. The presence of alkyl chains with polar embedded groups made the functionalized MWCNTs (f-MWCNTs) a mixed-mode GC separation material able to interact in different ways with the analytes. Compared with non-functionalized MWCNTs (nf-MWCNTs), MWCNTs-R-NH(2) had higher selectivity, enhanced resolution, and optimum retention behaviour, and they were proved to perform better than the commercial stationary phase Porapak QS (PQS), claimed to be suitable for similar applications. The so-prepared stationary phase was used for analysis of a synthetic mixture containing different classes of analytes, viz. esters, ketones, alcohols, alkanes, and aromatic hydrocarbons, and finally used for investigation of similar real matrices. In particular, the constituents of a commercial paint thinner were determined by direct injection of the sample, with good reproducibility (inter-day precision RSDs from 5 to 19%). Two unknown samples of commercial white spirit were also analysed for determination of the aromatic hydrocarbon content, and their composition was profiled on the basis of the different compounds identified.

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“…The use of carbon nanotubes has already been reported as a solid-phase extraction adsorbent for chemical analysis in environmental fields [14][15][16] or as a new stationary phase for liquid [17] and gas chromatographic columns [18,19]. In those applications, carbon nanotubes are either packed or deposited on the surface of porous silica microspheres [20] or incorporated into a monolithic stationary phase [21] with very random distribution and no specific direction. There are only two literatures that describe the in situ growth of CNTs in a chromatographic column, either directly on the inner wall of a stainless steel tube [22] or a silicon microfabricated column [23].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured pillars based on vertically aligned carbon nanotubes as the stationary phase in micro‐CEC

Yang

Wang

et al. 2009

Electrophoresis

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We present a micro-CEC chip carrying out a highly efficient separation of dsDNA fragments through vertically aligned multi-wall carbon nanotubes (MWCNTs) in a microchannel. The vertically aligned MWCNTs were grown directly in the microchannel to form straight nanopillar arrays as ordered and directional chromatographic supports. 1-Pyrenedodecanoic acid was employed for the surface modification of the MWCNTs' stationary phase to adsorb analytes by hydrophobic interactions. This device was used for separating dsDNA fragments of three different lengths (254, 360, and 572 bp), and fluorescence detection was employed to verify the electrokinetic transport in the MWCNT array. The micro-CEC separation of the three compounds was achieved in less than 300 s at a field strength of 66 V/cm due to superior laminar flow patterns and a lower flow resistance resulting from the vertically aligned MWCNTs being used as the stationary phase medium. In addition, a fivefold reduction of band broadening was obtained when the analyte was separated by the chromatographic MWCNT array channel instead of the CE channel. From all of the results, we suggest that an in situ grown and directional MWCNT array can potentially be useful for preparing more diversified forms of stationary phases for vertically efficient chip-based electrochromatography.

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Carbon nanotubes on HPLC silica microspheres

Cited by 56 publications

References 9 publications

Methane preconcentration in a microtrap using multiwalled carbon nanotubes as sorbents

Methane preconcentration in a microtrap using multiwalled carbon nanotubes as sorbents

Improving selectivity in gas chromatography by using chemically modified multi-walled carbon nanotubes as stationary phase

Nanostructured pillars based on vertically aligned carbon nanotubes as the stationary phase in micro‐CEC

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